docs(06): capture phase context

Phase 06: Deployment
- Implementation decisions documented
- Phase boundary established

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/phases/06-deployment/06-CONTEXT.md

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+# Phase 6: Deployment - Context
+
+**Gathered:** 2026-02-01
+**Status:** Ready for planning
+
+<domain>
+## Phase Boundary
+
+Application runs in Docker with persistent data and easy configuration. Single docker-compose.yml starts the entire application. Data persists via named volumes.
+
+</domain>
+
+<decisions>
+## Implementation Decisions
+
+### Container Setup
+- Node Alpine base image (small ~150MB)
+- Multi-stage build: separate build dependencies from runtime
+- Run as non-root user ('node' user for security)
+- Include /health endpoint for Docker health checks
+
+### Environment Configuration
+- Extended config scope: PORT, DATA_DIR, log level, max upload size, etc.
+- TASKPLANER_ prefix for all env vars (e.g., TASKPLANER_PORT)
+- All env vars have sensible defaults (works out of the box, zero config required)
+- Document in both README and .env.example template file
+
+### Data Persistence
+- Single volume for all data (/data mount with db + images subdirs)
+- Include backup.sh script that users can run
+- Backups stored in local ./backups directory by default
+- App auto-creates /data/db and /data/images directories on first run
+
+### Production Assumptions
+- Designed to run behind reverse proxy (Nginx/Traefik handles HTTPS)
+- docker-compose includes app only (no bundled reverse proxy)
+- JSON logging format for log aggregators
+- Trust X-Forwarded headers from proxy (for correct client IP logging)
+
+### Claude's Discretion
+- Exact multi-stage build structure
+- Which extended env vars to include beyond PORT/DATA_DIR
+- Health check implementation details
+- Backup script format (tar, timestamp naming)
+
+</decisions>
+
+<specifics>
+## Specific Ideas
+
+- Works out of the box with zero configuration
+- Single command to start: `docker-compose up -d`
+- Backup script should be simple to run manually
+
+</specifics>
+
+<deferred>
+## Deferred Ideas
+
+None — discussion stayed within phase scope
+
+</deferred>
+
+---
+
+*Phase: 06-deployment*
+*Context gathered: 2026-02-01*